[pstricks] incorrect xLabels

[Fabian Brunner]

Hello everyone,

I have problems with axis labels. Can anyone explain why the following 
code produces
incorrect x-labels (the first label is missing, the second is '.75a'). 
I'm using texlive2012.

\documentclass[a4paper,12pt]{article}
\usepackage{pst-plot}
\begin{document}
\psgraph[axesstyle=frame,Oy=0.75,Dy=0.05,xLabels={a,b,c,d,e,f,g,h,i,j,k}](0,0.75)(10,1.5){4in}{4in}%
\endpsgraph
\end{document}

The following code works nicely:
\psgraph[axesstyle=frame,Oy=0.0,Dy=0.05,xLabels={a,b,c,d,e,f,g,h,i,j,k}](0,0)(10,1){4in}{4in}%
\endpsgraph

Thank you!
Fabian